Herculaneum, MO

HERCULANEUM, a post-village of Jefferson county, Missouri, on the Mississippi river, 30 miles below St. Louis. It was formerly the county seat, and a great mart for the lead procured from the mines in the vicinity. The place was almost entirely destroyed by a flood in 1844. (Baldwin & Thomas, A New and Complete Gazetteer of the United States ... 1854)

HERCULANEUM, A post village of Jefferson county, on the west bank of the Mississippi river, 11 miles from Hillsboro', the county seat, 23 miles from St. Louis, and 102 miles from Jefferson City.  There are several shot towers and factories in the vicinity.  (The Missouri State Gazetteer and Business Directory, 1860)